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A New pH Sensor Based on a Glassy Carbon Electrode Coated with a Co/Al Layered Double Hydroxide
Author(s) -
Mignani A.,
Corticelli C.,
Tonelli D.,
Scavetta E.
Publication year - 2011
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201100058
Subject(s) - electrode , calibration curve , glass electrode , hydroxide , analytical chemistry (journal) , materials science , reproducibility , glassy carbon , reference electrode , carbon fibers , inorganic chemistry , quinhydrone electrode , range (aeronautics) , cobalt , detection limit , chemistry , electrochemistry , cyclic voltammetry , composite material , chromatography , composite number
A glassy carbon electrode has been coated by electrodeposition with a thin film of cobalt based layered double hydroxide (LDH) and used as a pH sensor. The developed electrode displays a linear super‐Nernstian response (−76.2±0.6 mV/pH) in the pH range between 2 and 14 and it is particularly suitable to operate in strongly alkaline solution. The reproducibility of the sensor construction is good with a relative standard deviation of the calibration curve slopes of±2.5 % ( n =4). The electrode has a response time comparable to that exhibited by commercial glass electrodes in the pH range examined and is not affected by interference from the most common anions and cations.